IOTA Viewer was designed to visualize messages generated by IOTA devices, which include various sensors with Sigfox wireless connectivity. Current version of IOTA Viewer provides access to measurements made by IOTA temperature and humidity sensors as well as various door and event-detecting sensors. Application allows users to connect devices using ID and passcodes provided with the devices and then view measurements or detected events on dynamic charts. Users may set alerts individually for each device and get notifications. For users’ convenience the devices can be individually named. Each user may have access to multiple devices and the same device may be accessed by many users, if they have access to correct ID and passcode.